Pipe and rod bending machine



B. SCHENK.

PIPE AND ROD BENDING MACHINE.

APPLlCATlON FILED DEC.29. 1919.

1,346,98 1. Patented July 20, 1920.

3 SHEETSSHEET I.

I N VEN TOR fiz'mwmmaa' SOHLWK,

BY W

ATTORNEYS.

Wm M

B. SCHENK.

PIPE AND ROD BENDING MACHINE.

APPLICATION FILED DEC-29.1919.

Patented July 20, 1920.

3 SHEETS-SHEET 2.

IN VEN TOR.

flz'mvmfi y' Sam/1 K,

' ATTORNEYS.

FIG. 4.

FIG. 7.

WITNESS:

B. SCHENK.

PIPE AND ROD BENDING MACHINE.

APPLlCATlON FILED DEC. 29. m9.

1 ,346,98 1 Patented July 20, 1920.

3 SHEETS-SHEET 3.

ATTORNEYS.

' Bod Bending Machines; and I UNITED STATES BERNHARDT SOHENK, OF CHICAGO, ILLINOIS.

PIPE AND ROD BENDING MACHINE.

Application filed December 29, 1919.

To all whom it may concern:

Be it known that I, BERNHARDT SoHENK, a citizen of the United States, and resident of the city of Chicago, inthe county of Cook and State of Illinois, have invented certain new and useful Improvements in Pipe and do hereby declare that the following description of my invention, taken in connection with the accompanying sheets of drawings, form a full, clear, and exact specification, which will enable others skilled in the art to which the said invention appertains to make and use the same.

This invention has general reference to a power-operated machine for bending rods and pipes; and it consists, essentially, in the novel and peculiar combination of parts and details of construction, as hereinafter first fully set forth and described, and then pointed out in the claims. One of the objects of this invention is the production of an eflicient and serviceable machine for bending rods and pipe without heating the same. Another'object is to so construct this machine that the bending proper is automatically performed after an operator has placed a pipe or rod into correct position and started the machine. A further object of this invention is to so construct this machine that it may be adjusted to bend pipe of any size within certain limits, and of any curvature and angularity, and that this machine will stop instantly when the proper or desired angularity has been obtained.

Other objects of this invention will be pointed-out as the description of this machine and its'operation proceeds.

In the drawings which serve to illustrate this invention in its preferred embodiment, and form a part of this specification-- Figure 1 is a side elevation of this power, pipe bending machine.

Fig. 2 is a plan of a portion of the machine below the line 2-2 of Fig. 1.

Fig. 3 is an end-elevation of the forming arm detached.

Fig. 4 is a plan of a portion of the machine above the spur gear wheel, showing the driving and guiding means for this gear Specification of Letters Patent.

Patented July 20, 1920. Serial No. 348,005.

wheel, other omitted.

Fig. 5 is a plan of the machine below the line 55 of Fig. 1.

Fig. 6 is a similar view below the line 6-6 of Fig. 1.

Fig. 7 is a sectional elevation on line 77 of Fig. 4, the driving pinion shown in Fig. 4 being omitted, the cover plate not being shown.

Fig. 8 is a detached detail of a bracket and journal bearing for the worm-shaft illustrated in Figs. 5 and 6.

Fig. 9 is a plan of the machine showing the same in the act of bending a pipe.

Fig. 10 is a plan of the forming arm on the indirect line 1010 of Fig. 1.

Fig. 11 is a longitudinal sectional view of this bending arm on line 11-11 of Fig. 10; Figs. 3, 10, and 11 being drawn on an increased scale.

Like parts are designated by the same characters and symbols of reference in all the various figures.

A, in these drawings indicates a standard or column which support-s the entire mechanism of this machine. iron or steel, cylindrical shell, having -at.its lower end a flange 12, forming a suitable base for the column, the upper end of said column being, preferably, closed by a substantial head 13, preferably welded into the shell A. Rotat-bly mounted upon this column there is placed a spur gear wheel B, consisting of an annular band the outer periphery of which is provided with gear teeth, there being on the inner periphery of said band an inwardly extending, annular projection 14, serving as a guide-way for said annular band.

Secured to upper end of the column A there are a multiplicity of angles or brackets 15, in the horizontal limbs of which there are provided stud bolts 16, on which. there are rotatably mounted rollers C, the circumferential grooves 17, of which engage the annular projections 14 of the spur gear wheel B, and thereby properly guide this wheel in its rotation.

At the sides of the column A, there are secured two brackets D, having journal parts of the machine being It is, preferably an may slide.

bearings 18, in which there is rotatably mounted a vertically disposed shaft 20, to the upper end of which there is secured a gear pinion E, which meshes with the spur gear wheel B.

Intermediate of the two brackets I) there is a further bracket F, secured to the column A, which bracket carries two journal bearings 21, detailed in Fig. 8, in which there is rotatably mounted a horizontally disposed shaft 22, which carries at one of its outer ends a driven pulley belt 23, receives motion from any source, preferably an electric motor, not shown. Upon this shaft 22, between the bearings 21, there is secured, or formed integrally therewith, 'a worm H; and upon the vertical shaft 20, there is aflixed a worm-wheel I, which meshes with the worm H and by which rotativc movement is imparted to the spur gear wheel B in an obvious manner.

Centrally in the head 13 of the column A there is affixed a stud 2%, on which there is oscillatably mounted mechanism J, which I prefer to term operating arm This arm consists of two fiat bars 25, 25, which are medially cranked or offset, as at 26, to alford a fork, the elements 25, 25 being secured together at their meeting ends, preferably by bolts 27.

To the lower side of the member 25 there are secured in spaced apart relationship two angle-bars 28, 28, best seen in Fig. 3; and between these two angle bars there is slidably mounted a latch L, being a vertically disposed bar the inner end 29, of which is constructed to engage the spur gear wheel B, as will hereinafter appear. This latch L has slotted apertures 30, in which bolts 31, are located, and upon which the latch L, In the members 25, 25 there are through slots 32, in which a hand lever V M is pivotally mounted upon a bolt 33, the

lower end of which lever being circular as at 34, to engage a similar notch 35, in the latch L.

Mounted upon the stud-bolt 2 1, between the forked members 25, 25 there is a grooved forming roller N; and spaced apart from this roller N there is mounted upon an axle 36, a second grooved roller I This axle is preferably polygonal in transverse section as shown at 37; and the bore of the roller P is correspondingly formed so that the roller P does not rotate upon its axle but may be lifted off its axle and its position changed thereon, as the case may require. In the forked members 25, 25* there are slots 38, of a width corresponding to two opposed sides of the polygonal axle 36, whereby said axle may be moved in said slots but is prevented from rotating therein.

At onev side of the central stud 24 on which the forming arm J oscillates, there is located a bracket R, FigS.. l. an 9," said G, which, by a 7 bracket having preferably, two limbs 39, 39;

In this bracket there is mounted upon a bolt 40, a third grooved roller S; said bracket It being movably mounted upon the machine by fliavirfg its bolts ll passing through slots 42, in a cover plate-T, placed above the spur gear wheel B.

Immediately below the spur gear wheel B there are mounted upon brackets 43, secured to the column A two segmental bars 44, best shown in Fig. 2, ing spaced apart relationship. To these bars there is movably secured a bar 45, by bolts 46, said bar being approximately V-shaped to afford an inclined plane 47 thereon; and secured to the lower edge of the latch L there is secured a similarly shaped bar 48, by bolts 48 having a vertically disposed member 49.

The operation of this machine is substantially as follows:

A pipe 50 or rod to be bent is placed upon the top of the machine between the roller S in the bracket R and the roller P in the forming arm when this arm is in its normal, starting position shown in dotted lines in Fig. 9. Then an attendant starts the motor to rotate the spur gear wheel B, and

he moves the lever M to cause the end 29 of the latch L to engage the rotatable spur gear wheel B in the space between the nearest teeth of same and thereby connects the forming arm to the spur gear wheel and cause it to move with said spur gear wheel. This will cause the pipe 50 to be bent around the forming roller N until the vertical member 4. .9 of the element 48 attached to the latch L reaches the inclined plane 47 onthe arcuate members 44:, and moving thereon pushes the latch L away from, and out of engagement with the spur gear wheel 13 and thus automatically stops the forming arm J at the moment when the proper desired angle of the pipe 50 has been reached, which can be attained by moving the inclined element 4-9 on the segments 44 to the required position.

It will now be noted that after the operator has started the movement of the forming arm J, the latter will be stopped automatically when the end of its predetermined movement has been reached, so that by moving the inclined element 45 to the: required position, any bend in the pipe. 50 up to, and

including, a return bend can be attained,

formed pipe, when the machine is ready. for

the next pipe to be bent.

I have hereinbefore stated that the roller P does not rotate upon its axle 36. owing to the polygonal. form of this axle. This causes the pipe 50 to move in the direction of the arrow shown in Fig. 9; but should in course of time wear occur on the roller P, this roller may be readily removed from its axle and its position thereon changed in an obvious manner.

Attention is now invited to the forming roller N around which the pipe is moved while being formed and which, thereby determines the curve of the pipe. It will, therefore, require a different forming roller for each} different curvature, which can be readily accomplished by removing the bolts 27 in the forming arm to separate the two members 25, 25 and to remove the forming roller and substitute the desired forming roller in place thereof. And in order to keep the roller S in the bracket R always in proper relationship to the forming roller N, this bracket R is movably mounted on the machine. The peripheral grooves in the three rollers N, R, and may be as large as the largest pipe to be formed; but rollers N, R, and P of different grooves may be provided when found desirable or necessary.

It will now be further noted that while the forming arm is automatically disengaged from the rotating spur gear Wheel at a predetermined point, it may also be manually disengaged at any position before it reaches its terminal position, by the operator manipulating the hand lever in the proper direction. This is desirable in case where only a few pipes are to be bent to avoid the trouble of making adjustment of the inclined plane; and also in case a pipe should break before it is finished and where the broken parts might cause injury to the mechanism. And finally, I have covered the mechanism, as far as possible, by the cover '1 to prevent scales which will invariabl result in pipe-bending from getting into the moving parts.

have hereinbefore described this machine in the preferred form of, exemplification of my invention, but I desire it to be understood that I am aware that details of construction described may be changed, and parts omitted without departing from the scope of my invention as defined in the appended claims.

Having thus fully described this invention, I claim as new, and desire to secure to myself by Letters Patent of the United States- 1. In a machine of the nature specified, the combination of a support, a spur gear wheel mounted on said support, said spur gear wheel consisting of an annular band, said band having on its external periphery gear teeth, said band having on its inner periphery an annular flange, a multiplicity of brackets extending from said support, studs extending upwardly from said brackets, and rollers mounted on said studs, said rollers having peripheral grooves engaging the inner annular flange of said spur gear wheel, mechanism for imparting rotative movement to said spur gear wheel, pipebending mechanism mounted above said spur gear wheel, said bending mechanism including an arm, manually operating means on said arm for connecting said arm to said spur gear wheel and automatically operating mechanism for disconnecting said arm from said rotating spur gear wheel.

2. In a machine of the kind described, a support, an annulus having a' toothed outer periphery arranged horizontally above said support for rotation on its axis, studs rising from said support, rollers mounted on the studs, the rollers and the inner periphery of the annulus provided with interengaging flanges for holding the annulus in its plane of rotation, means for rotating said annulus, pipe bending means above said annulus including a horizontally swinging arm carrying a pipe forming sheave and pivotally moimted at the axis of said annulus, manually operable means on the arm for connecting the arm to said annulus, and automatically operating mechanism for disconnecting said arm from said annulus at predetermined positions.

3. In a machine of the kind described, a support, an annulus provided with teeth on its outer periphery and mounted on said support for rotation on a vertical axis, means engaging the teeth of the annulus for rotating the same, vertical studs rising from said support, rollers on said studs within said annulus, the rollers and annulus having interengaging flanges for holding the annulus against movement longitudinally of its axis, a pipe bending arm mounted for swinging horizontally above said annulus on the axis of rotation thereof, means on said arm for engaging same with the teeth of the annulus to swing said arm, and coacting means on the arm and said support for automatically disconnecting the arm from said annulus, a pipe bending sheave mounted concentrically of said annulus, a second pipe bending sheave carried by said arm, and a relatively stationary pipe holding sheave carried by said support.

4. In a machine of the kind described, a support, an annulus having a toothed outer periphery arranged horizontally above said support for rotation on a vertical axis, studs rising from said support, rollers mounted on the studs, the rollers and the inner periphery of the annulus provided with interengaging flanges for holding the annulus in its plane of rotation, means engaging the teeth of the annulus for rotating the same, pipe bending means above said annulus including a horizontally swinging arm carrying a pipe forming sheave and pivotally mounted at the axis of said annulus, manually operable means on said arm for connesting the arm With the teeth of the annulus for rotation therewith, an adjustable throwoif carried by the support and a cooperating projection carried by the arm for disconnecting the arm and annulus at differe nt points according to the degree of bend to be made in the pipe.

5. In a machine of the kind described, a support, an annulus having a toothed outer periphery arrangedhorizontally above said support for rotation on a vertical axis, studs rising from said support, rollers mounted on the studs, the rollers and the annulus provided with interengaging flanges for holding the annulus in its plane of rotation, means engaging the teeth of the annulusfor rotating same, pipe bending means above said annulusincluding a horizontally swing ing arm carrying a pipe forming sheave and pivotally mounted at the axis of rotation of said annulus, a radially movable member on the arm, a lever pivoted on the" arm and engaging the member for moving it into engagement with the teeth of the annulus for swinging the arm With the annulus, an adjustable knee on the support, and a fixed knee carried by the arm for disconnecting the arm from the annulus at predetermined points.

In testimony that I claim the foregoing as my invention, I have hereunto set my hand.

BERNHARDT SCHENK. 

